Kulo ... there is a grey area (or confusion) between 僵尸 and 吸血僵尸, and if you have watched even one or two of those HK movies, you would have noticed that they tend to be the same thing ...

... and whether it be vampires or zombies or 人肉叉烧包, they are supposed to frighten you, so making them pretty and handsome actually changed the "purpose" ... I suggest you check out Christopher Lee who was famous for many of the old monster movies. especially
his portrayal of vampire :)